I’m not saying cars don’t have consumables, I’m saying a car doesn’t brick itself when it decides that you’ve driven sufficient miles to need to replace the relevant filters. That you can replace your filters yourself is a secondary (though related) issue.
Doesn't belt wear produce noticeable symptoms prior to actual failure? I recall timing belt issues at least being noticeable prior to them failing - the only sudden failure I am aware of was when the engine dropped out of the bottom of my parents car when I was a kid - and honestly you could have argued that that car was itself evidence that everything in it needed to be replaced.
